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- W2121569417 abstract "Three different units are exposed underneath the Palaeozoic sequence of W Pontides in the Bolu-Yedigoller area. These are, from the structural base to the top: i) high grade metamorphic rocks (the Sunnice group), ii) granitoids and, iii) a volcanic sequence (the Casurtepe formation) into which the granitoids intruded. The granitoidic intrusions are a part of an extensive group of intrusions, called the Bolu Granitoid Complex (BGC) and, together with the Casurtepe formation, they crop out structurally ontop of the Sunnice group along a NE-SW trending, NW-dipping tectonic contact. The granitoids are cut by a number of lamprophyre dykes. The Casurtepe formation, the main subject of this paper, comprises of andesitic lavas at the base, overlain by an ignimbrite serie in which rhyolitic volcaniclastics are dominant. Both the volcanic sequence and the granitoids were metamorphosed to greenschist facies and as a result, an albite+epidote+chlorite+actinolite mineral assemblage was developed, together with relict igneous minerals. An extensive pyrite mineralization is developed along sinous shear zones in locally developed intense hydrothermal alteration areas. Massive lavas of the volcanic sequence are calc-alkaline andesitic and locally rhyo-dasitic in composition with high SiO2 content (> % 54). These have LIL-element enrichment relative to N-type MORB and show Nb depletion relative to LREE (La, Ce, Nd). The dykes within the granites have similar chemical characteristics. One sample analysed from the Casurtepe formation gave 87Sr/86Sr" @default.
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- W2121569417 date "1998-01-01" @default.
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- W2121569417 title "AN EXAMPLE FOR A PRE-EARLY ORDOVICIAN ARC MAGMATISM FROM NORTH TURKEY: GEOCHEMICAL STUDY OF THE ÇAŞURTEPE FORMATION (BOLU, W PONTIDES)" @default.
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